wp1.5, lost in template default

hi,

I want to change some stuff in the comment template, but I can’t find the lines in the template. looking at the templates (I’m working in the default theme) I don’t know where to find what. There is a header, a page, comment, footer, maintemplate etc. Is there a overview somewhere what I can find where? and so what do I have to change where.
p.e. I want to remove the lines on top of the commentpage where it says ‘this entry was posted..etc etc’ but I can’t find the lines for this anywhere in the comments template and i get a little confused with all this templates, so if there is a page somewhere where i can find out what each template does, i will be very happy